FRB Dispersion Delay Calculator

Compute the arrival-time difference between two radio frequencies from a given dispersion measure (DM).

Constant k = 4.148808 s·MHz² per pc·cm⁻³
Signed delay (f₁ relative to f₂)
— s
Absolute delay
— s

Formula: Δt = k · DM · (1/f₁² − 1/f₂²), with k = 4.148808 s·MHz² per pc·cm⁻³. Enter frequencies in MHz.

// Example: // const dt = frbDelaySeconds(500, 20, 30); // ≈ +2.88 s (20 MHz arrives later than 30 MHz)

Signed output: positive if f1 < f2 (low frequency arrives later).